From 12633e803a2a556f6469e0933d08233d0844a2d9 Mon Sep 17 00:00:00 2001 From: Nathan Fontenot Date: Wed, 25 Nov 2009 17:23:25 +0000 Subject: sysfs/cpu: Add probe/release files Version 3 of this patch is updated with documentation added to Documentation/ABI. There are no changes to any of the C code from v2 of the patch. In order to support kernel DLPAR of CPU resources we need to provide an interface to add (probe) and remove (release) the resource from the system. This patch Creates new generic probe and release sysfs files to facilitate cpu probe/release. The probe/release interface provides for allowing each arch to supply their own routines for implementing the backend of adding and removing cpus to/from the system. This also creates the powerpc specific stubs to handle the arch callouts from writes to the sysfs files. The creation and use of these files is regulated by the CONFIG_ARCH_CPU_PROBE_RELEASE option so that only architectures that need the capability will have the files created. Signed-off-by: Nathan Fontenot Signed-off-by: Benjamin Herrenschmidt --- include/linux/cpu.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include/linux/cpu.h') diff --git a/include/linux/cpu.h b/include/linux/cpu.h index 47536197ffdd..c972f7ccb7d3 100644 --- a/include/linux/cpu.h +++ b/include/linux/cpu.h @@ -43,6 +43,8 @@ extern int sched_create_sysfs_power_savings_entries(struct sysdev_class *cls); #ifdef CONFIG_HOTPLUG_CPU extern void unregister_cpu(struct cpu *cpu); +extern ssize_t arch_cpu_probe(const char *, size_t); +extern ssize_t arch_cpu_release(const char *, size_t); #endif struct notifier_block; -- cgit v1.2.2